Otherwise known as "C-Rations". MRE's are basically pre-ready food for use on the battlefield. High in calories, they are capable of lasting for weeks as well. MRE's usually consist of canned food, such as beans. MRE's are often rationed to be a whole day's meal, complete with a desert (which is usually a chocolate bar). MRE's also have drinks that only require warm water to become ready to drink.